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HomeMy WebLinkAboutAGENDA REPORT 1991 0501 CC REG ITEM 08LMOORPARK 799 Moorpark Avenue Moorpark, California 93021 TO: The Honorable City Council FROM: Charley Abbott, City Engineer DATE: April 22, 1991 (Council Meeting May 1, 1991) ITEM (805) 529 -6864 = ORPAI2K, CAUFFORNIA C ty Council Meeting of ACTION: By SUBJECT: Consideration of a conceptual plan for a sidewalk on the northside of Los Angeles Avenue from Millard Street to Spring Road. INTRODUCTION The scope of work is to design curb & gutter, sidewalk along the north side of Los Angeles Avenue, from Millard Street to Spring Road in the City of Moorpark. II_ EXISTING CONDITION Existing Los Angeles Avenue is a 4 -lane street with a middle turning lane (16' lane) and paved shoulder. The total street width is 91' from the curb on the sorthside to the edge of pave- ment on the northside. The existing right -of -way is 109' wide. Walls have been constructed along the northerly right -of -way line. These walls are either free standing walls or retaining walls with questionable structural value. No "As- Built" informa- tion is available for the walls. Based on information obtained from Caltrans and the City, it is found that the existing right -of -way along Los Angeles Ave is 50 feet from the center line of the roadway on the north side and 59' feet on the south side. ( Please refer to figure 1.) In addi- tion, there is an it feet "future dedication of right -of -way area south of the existing southerly right -of -way line. This in- formation can be found on Caltrans plan - contract No.07- 022684 and on PD -1064 Los Angeles Avenue Widening Project Plan. The existing pavement is in good condition. " information, the Los Angeles Avenue was Based on constructed wit" th 0. 8' of aggregate base and 0.45' of asphalticconcrete. The ex- isting longitudinal roadway slope (from west to east) is ap- proximately 0.5 %. The transverse slope on existing roadway averages 2 %. Currently, on the north side, surface water flows along the edge of the pavement from Spring Road to Millard Street, and then turns north flowing along Millard Street. PAUL W.LAWRASON JR. BERNARDO M.PEREZ SCOTT MONTGOMERY Ma or ROY E. TALLEY JR. JOHN E. WOZNIAK y Mayor Pro Tem Counc lmember Councilmember Councilmember PAGE TWO Los Angeles Avenue is a major arterial with high traffic volume and heavy truck traffic. The Los Angeles Avenue /Spring Road in- tersection has been signalized with a control box located at the northwest corner of the intersection. Along the north side of Los Angeles Avenue there are several utility lines running be- tween the edge of pavement and the right -of -way line. A High Voltage power line (GGKV) with poles and guy wire anchors runs approximately 2' to 5' north of the edge of pavement. Next to the power line, there are telephone boxes, cable TV boxes, gas line control boxes, a signal control box and .sign posts above ground. II. PROPOSED PAVEMENT AND CURB & GUTTER CONSTRUCTION A standard Caltrans Type A2 -8 curb & gutter is proposed. The Proposed typical sections attached are based on this standard. The flow line along the gutter will be designed such that the proposed construction will not alter the existing water flow pat- tern. Due to variation in the transverse slope, a grade break will be used at 32' from the center line to maintain the flowline after construction. The maximum grade break will not be more than 0.5% change from existing slopes. The proposed construction includes (see Fig.2): Removal of a 2' strip of both pavement and subbase, removal of an additional 2' of pavement without subbase by cold milling, and cold milling of an additional 4' strip to a depth of 0. 1'. The total width of the pavement construction will be 8'. A gutter would be con- structed in the first 2' strip. Pavement only would be added to the second 2' strip. A 0.10' overlay would top the remaining 4' of cold milled pavement, and be butt joined to the existing pave- ment 32' from the center line of the street. III. PROPOSED SIDEWALK The criteria used for designing the sidewalk (see figure 2) were obtained from Caltrans. These are: 1. Minimum sidewalk width of 5' 2. Finish grade of sidewalk shall have minimum cross slope of 1/4" per foot. 3. Back edge of sidewalk shall be placed on the right -of- way line. PAGE THREE 4. A monolithic pour of sidewalk and curb & gutter will not be permitted. 5. If the back edge of the sidewalk is not placed on the right -of -way line, brass right -of -way markers should be installed. IV. DESIGN CONSIDERATIONS The following factors were taken into consideration during the conceptual design stages 1. The alignment of the proposed curb & gutter with the existing curb & gutter west of Millard Street. 2. The accommodation of 6 lanes and a middle turning lane within the existing right -of -way limit in the future. 3. Possible relocation of the Southern California Edison (SCE) major power line (66KV). 4. Possible relocation of the cable TV and telephone control boxes. 5. Possible reduction of the sidewalk width to less than 5' at the power pole locations. V. CONSTRUCTION FEASIBILITY SAFETY AND COST Several alternatives were studied and discussed with different review agencies. The Southern California Edison recommended not relocating the power line because of its function (66KV major power line) and cost (815,000 - $20,000 per power pole relocation and $70 - $100 per linear foot of power line relocation). There is a corner power pole located at the northeast corner of Los An- geles Avenue and Millard Street that would interfere with con- struction of a typical handicap ramp and may need to be relocated to a new position. SCE suggested leaving this power pole in place and working around it. They said this is a fairly common situation in this area. They estimated the cost of relocation of this power pole to be $15,000 to $20,000. Pacific Bell has a major telephone control box located approximately 960 feet east of Millard Street. They said this is a major control box, and hosts about 1000 to 5000 telephone lines. They recommend not relocating or burying this box due to cost and maintance problems. PAGE FOUR Through discussions with Caltrans permit inspector, it has been agreed that, due to the location of power pole, Caltrans will al- low minimum sidewalk width of 4' -0" at power pole locations only. VI. RECOMMENDATIONS Based on the above mentioned considerations, the uncertain condi- tion of the northerly boundary wall and the desire to line up the proposed curb & gutter with the existing curb & gutter west of Millard Street, the construction of a 10'foot parkway with a 5 ' foot sidewalk adjacent to the proposed curb & gutter is recom- mended, as shown in Fig.2. In the future, this layout will be able to accommodate 6 lanes and a middle turn lane. This future typical cross section is shown in Fig.3. In addition, it is also recommended to leave the corner power pole at the northeast cor- ner of Los Angeles Avenue and Millard Street in place as long as it does not impose any danger to the public, and is approved by Caltrans. If during the formal design review process, Caltrans or other utility agencies object to the location of the proposed sidewalk, it may be relocated close to the right -of -way as show in the alternate solution presented in Fig.4. The transitions of the sidewalk near the power poles for both sidewalk alternatives are shown in Fig. 5. \`R /w %DGEO�FPA�VEM�ENT �\ LOS ANGELES AVE. EXISTING CROSS SECTION FIGURE 1 CONCFPTt]AI TYPICAL CROSS SECTION s s i� 07 "m n +..� — Wera a..� R/W EXISTING C L 10,-0 40' —O" I 4,_41, 5,_ o„ O,r �„ 40'-- 0„ 2' 2`14 0 32,_0„ PROPOSED GRADE BREAK. 1/4-/FT O © �� O EXISTING PAVEMENT 4" PCC 4" SUBBASE PROPOSED TYPICAL CROSS SECTION FIGURE 2 CONSTRUCTION NOTES: (D CONSTRUCT NEW ASPHALT CONCRETE PAVEMENT TO F)Ntgi GR11DE. Q CONSTRUCT T7PE A2 -8 CURB AND GUTTER PER CALTRANS STD. N8--A (3 COLD MILL EXISTING ASPHALT CONCRETE PAVEMENT (110' DEEP PER TYPICAL SECTION. 0 REMOVE EXISTIIJG ASPHALT CONCRETE PAVEMENT. G REMOVE 49 CONSSTRUCT54 'PORTLAND CEMENT CONCRETE�(a -*M -A-CLASS �EWVAALK GATE BASE CONCEPTUAL m CONSTRUCT 4- PEA GRAVEL /SAND SUBBASE. T YP I-C A L CROSS SECTION EXISTING R/W 55' 10' 45` 109' 1 i ..r. ae.nr enc as voi a PROPOSED C.L. SHIFT C.L. 5' 46' 5 38' I 7, 14' 2 012' = 24' 14 2' 12' 12' 12 MEDIAN 54' FUTURE 6 CANE CROSS SECTION FIGURE 3 V R/W n ib 0„ R/W 10' -0" /4" 5'- 0"14' -0 2' 12'1 49-W 4" PCC 4" SU68ASE CONSTRUCTION NOTES: (DA- ai Q V 40'- 0" 40' -0" ALTERNATE TYPICAL CROSS SECTION FIGURE 4 o ra si yosw� sa o�� CA (D CONSTRUCT NEW ASPHALT CONCRETE PAVEMENT TO FINISH GRADE: @ CONSTRUCT TYPE A2 -8 CURB AND GUTTER PER CALTRANS STD- NB-A 0 COLD MILL DUSTING ASPHALT CONCRETE PAVEMENT 0.10' DEEP PER TYPICAL SECTION- 0 REMOVE EXISTING ASPHALT CONCRETE PAVEMENT. 0 REMOVE DUSTING ASPHALT CONCRETE PAVEMENT AND CLASS B AGGREGATE BASE. CONCEPTUAL 6 CONSTRUCT 4' PORTLAND CEMENT CONCRETE (CLASS -A") SIDEWALK. (2) CONSTRUCT 4" PEA GRAVEL/SANG SUBBASE. TYPICAL CROSS SECTION r r r t g 11 c 111r. 11 r r r V r J L � J v n � n f o J a U = W o p0 w t N 12 DIA. •• io vt POWER POLE a = ) ) SIDEWALK TRANSITION = o (SIDEWALK LOCATED CLOSE TO R /W) CURB _PROPOSED DFT:gi( Mn ? Q _U Q O R/W 12' D[A. POWER POLE M SIDEWALK TRANSITION (SIDEWALK LOCATED ADJACENT TO CURB & GUTTER) DETAIL NO. 1 FIGURE 5 SIDEWALK TRANSITION (SIDEWALK LOCATED ADJACENT TO CURB & GUTTER) DETAIL NO. 2 f o R U = W o p0 w t N 12 DIA. •• io vt POWER POLE Q O ) ) SIDEWALK TRANSITION (SIDEWALK LOCATED CLOSE TO R /W) CURB _PROPOSED DFT:gi( Mn ?